Influence of Coating Layer on Acoustic Wave Propagation in a Random Complex Medium with Resonant Scatterers
Hang Yang1, Xin Zhang1**, Jian-hua Guo2**, Fu-gen Wu3, Yuan-wei Yao1
1School of Physics and Optoelectronic Engineering, Guangdong University of Technology, Guangzhou 510006 2School of Materials Science and Engineering, South China University of Technology, Guangzhou 510640 3Department of Experiment Education, Guangdong University of Technology, Guangzhou 510006
Abstract：We investigate the influence of coating layer on acoustic wave propagation in a dispersed random medium consisting of coated fibers. In the strong-scattering regime, the characteristics of wave scattering resonances are found to evolve regularly with the properties of the coating layer. By theoretical calculation, frequency gaps are found in acoustic excitation spectra in a random medium. The scattering cross section results present the evolution of scattering resonances with the properties of the coating layer, which offers a good explanation for the change of the frequency gaps. The velocity of the propagation quasi-mode is also shown to depend on the filling fraction of the coating layer. We use the generalized coherent potential-approximation approach to solve acoustic wave dispersion relations in a complicated random medium consisting of coating-structure scatterers. It is shown that our model reveals subtle changes in the behavior of the acoustic wave propagating quasi-modes.
(Mechanical wave propagation (including diffraction, scattering, and dispersion))
引用本文:
. [J]. 中国物理快报, 2019, 36(8): 84301-.
Hang Yang, Xin Zhang, Jian-hua Guo, Fu-gen Wu, Yuan-wei Yao. Influence of Coating Layer on Acoustic Wave Propagation in a Random Complex Medium with Resonant Scatterers. Chin. Phys. Lett., 2019, 36(8): 84301-.
2019, Vol. 36 
